Easy Grader — grade any test in seconds
Enter the number of questions and how many were missed. Get the percentage, the letter grade, and a full grading chart for the whole class — all in one go.
What is an easy grader?
An easy grader is a tool that turns the number of wrong answers on a test into a percentage and a letter grade, instantly. Teachers used to do this with a small sliding paper card — line up the number of questions with the number wrong, and read off the score along the edge. This calculator does exactly the same job, just faster, more accurate, and without the physical card.
It's built for the moment you're sitting with a stack of graded tests and need to convert raw scores into something you can record — a percentage for your gradebook, and a letter grade for the report card. Instead of doing the division and rounding by hand for every single paper, you do it once per question count and read the rest off the chart.
How to use the easy grader
- Enter the total number of questions on the test using the field above. This sets up the scale for the whole chart.
- Enter how many answers were wrong for the student you're grading. Count blank or unanswered questions as wrong too.
- Pick a grading scale. Standard is the most common in US schools (90% and up is an A), but Strict and Lenient scales are available if your school uses different cutoffs.
- Read the result. The percentage and letter grade appear immediately above, recalculating as you type.
- Open the grading chart if you're grading more than one paper with the same question count — it lists every possible score and letter grade for that test, so you only need to look up the number wrong for each student.
Worked example
Say a test has 25 questions and a student got 3 wrong. That's 22 correct out of 25, which works out to 88% — a B+ on the standard scale. Change the total to 25 and wrong answers to 3 in the calculator above to see this confirmed instantly, along with the full chart for every other score on the same 25-question test.
Why use an easy grader instead of doing it by hand
Grading one paper by hand is manageable. Grading thirty papers from the same test is where it gets slow, and where small arithmetic mistakes start to matter — a single subtraction error can shift a student into the wrong letter grade entirely. An easy grader removes that risk completely, and the chart view means the calculation only happens once per test, not once per student.
- No formulas to remember or re-derive each grading session
- One chart works for an entire class taking the same test
- Choose from three common grading scales used in different schools
- Everything runs in your browser — nothing you enter is saved or sent anywhere
Tip: if your course grades by weighted categories — homework, midterms, finals — rather than single tests, a weighted or section-based grade calculator is the better tool for that, since this one is built specifically for question-count grading.
Common grading scales explained
| Percentage | Standard | Strict | Lenient |
|---|---|---|---|
| 90–100% | A | A−/A | A |
| 80–89% | B | B/B+ | A−/B+ |
| 70–79% | C | C/C+ | B/B− |
| 60–69% | D | D/D+ | C/D |
| Below 60% | F | F | F (below 50%) |
Grading scales vary by school, district, and sometimes by individual teacher. If yours doesn't match any of the three built into this calculator, use the percentage result directly and apply your own cutoffs when assigning the final letter grade.
Frequently asked questions
18 out of 20 is 90%, which is an A− on the standard scale. Enter 20 total questions and 2 wrong into the calculator above to confirm, along with every other score out of 20.
45 out of 50 is 90%, an A− on the standard scale. Set total questions to 50 and wrong answers to 5 to confirm and see nearby scores on the chart.
It subtracts the wrong answers from the total questions to get the number correct, divides that by the total, and multiplies by 100. The result is matched to a letter grade using whichever scale you select.
Yes. Once you set the total number of questions, the grading chart shows every possible score for that test. You can look up each student's score from the chart without recalculating for every paper.
Yes, completely free with no sign-up required. All calculations happen in your browser, and nothing you enter is stored or shared.
Pick the closest built-in scale, or just use the percentage result and apply your school's own letter-grade cutoffs manually.